Magazine arc-lamp.



Wipes 5e25 J. BROCKIE.

MAGAZINE ARC LAMP; APPLICATION FILED FEB. I6 1914.

I 1,229,876. Y PatentedJune12, 1917. 1

3 SHEETS-SHEET I.

J. BROCKIE. MAGAZINE ARC LAMP.

9:4. 1,,2295876. Patented June 12,1917.

3 SHEETS-SHEET 2.

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J. BROCKIE.

MAGAZINE ARC LAMP.

APPLI CATION FILED FEB. 16. 1914.

1,229,876. Patented June 12, 1917.

a SHEETS-SHEET 3'.

awoe/wtoz I JAMES BROGKIE, or ronnsr HILL, LONDON, ENGLAND.

MAGAZINE ABC-LAMP.

Specification of Letters Patent. Patgntqd J 11116 12, 1917.

Application filed February 16, 1914. Serial 1101819915.

To all whom it may concern:

Be it known that I, JAMns Bnoom, a subject of the King of Great Britain,residing in London, England, and whose post-office address is 41 Londonroad, Forest Hill, in"

the county of London, England, have invented certain new and usefulImprovements in Magazine .Arc-Lamps, of which the following is aspecification. r

This invention relates to magazine are stantially annul the period ofdarkness in changing from one ,pair of carbons to another.

According to the present invention the arc' is re-started when the newcarbons have been fed. forward to within a distance less thanthat'between the burning carbons, the extinction of the lamp beingmomentarily efl'ected either by temporarily short circuiting it or byblowing out the existing are by any suitable means.-

Two main advantages of this invention .are (1) that a main coil can beused to separate the magazines in order to obtain or strike the arc andto retain the magazines in that position, the further or future actualfeed of the carbons being effected or controlled by the shunt coil only,instead of by the usual differential arrangement of coils; and (2) theare when first formed or struck occupies the same position in relationto the lamp reflector'as the old or consumed carbons, thus securinggreater steadiness of the light during the first few minutes after a newpair of carbons has commenced to burn. The invention further consists ina certain novel arrangement, construction and combination of partshere-. inafter more fully described and finally pointed out in theappended claims.-

In the accompanying drawings Figure 1 is a side elevation showing theessential parts of a double chamber magazine are lamp embodying thisarrangement, Fig. 2 being an end elevation on an enlarged scale of oneof the double magazines and carbon feeding device. Fig. 3 is adiagrammatic view showing the electrical circuits for the difierentoperative parts of the lamp. It will be understood, however, that theinvention is of general application and may be applied to single chambermagazine lamps, as well as to double. chamber maga" zine lamps.

The present invention is applicable generally to are lamps, and carbonstoring magazlnes of different types may be used.

Asan example, the carbon storing magazines shown in the present instanceare of the type disclosed generally, in my British Patent, No. 27 ,7 25of 1906. These magazines chambers being supplied with carbons. fromtheir respective outer sides, and the springs 14 shown in Fig. 2 operateon the carbons and between the walls of the respective magazines to feedthe carbons from the outer sides toward the center of the maga zine.Thecenter of the magazine is slotted vertically or longitudinally, andan endless chain 15 operates in the slot. One of these chains isprovided for each magazine, the chains passing over suitable sprocketwheels 16 and 17 toward the upper'and lower ends of the respectivemagazines, and the inner stretches of the chains arecaused to movedownwardly or toward the arcing point by an electric motor 19, the shaft20 of which is shown geared to the sprocket wheels 16 of the two chains;Each chain carries a suitable number of projections 3, these projectionsbeing spaced at suitable intervals along the chain, depending upon thelength of the carbons, ,and these projections extend alternately fromopposite sides of the chain. In consequence, the, downward movement ofthe inner stretchof the chain of each magazine will cause the projection3 extend- .ing to one side of the chain to feed a carbon automaticoperation of the lamp.

the present instance, is fitted with a pair of contacts 2 which areinsulated therefrom,- and these contacts are adapted to be engaged.

alternately and successively by the carbon 100 One of the magazines, themagazine 1 in I feeding projections 3 on the respective chains toperform functions to be hereinafter described.

The magazines are attached attheir upper ends to the under side of acrown plate 11.

In order to enable the carbons to be brought together to close thecircuit between them and to subsequently separate to draw theare, themagazines are relatively movable at their lower ends. As shown, themagazines are supported from the crown plate 11 by the brackets 12, andone of the magazines,

- the magazine 1 in the present instance, is

. magazine is effected by a series-connected solenoid 6, the verticallymovable core 7 of which is connected by linkage 8 to the magazine 1whereby energization of the solenoid 6 will operate the linkage 8 torelatively separate the lower ends of the magazines while deenergizationof this solenoid will cause the lower end of the magazine 1 to movetoward the lower end of the cooperating magazine. Feeding of thecarbons'by the motor 19 is controlled by the shunt solenoid 4, thevertically movable core of this solenoid being operatively connected toan intermediately pivoted lever 9, and this lever in turn controlscontacts 23 which are included in the circuit of'the feed motor 19. Thelever 9- also' controls the contacts 22 of a cut-out 5, the latterperforming the function of extinguishing the are between the burningcarbons preparatory to their replacement by a fresh pair of carbons. and23 controlled by the shunt solenoid 4 are so positioned that the normalenergization of the shunt solenoid 4 during the operation of the lampwill be sufiicient to engage the contacts 23 and cause the motor 19 tooperate to feed the carbons, but such normal energization will beinsuflicient'to move the lever 9 to the point where the contacts 22 ofthe cut-out 5 will be engaged. 'However, when the shunt solenoidreceives an energizing current of increased strength, the lever 9 willbe moved sufficiently to engage the contacts 22.

According to the present invention, when a pair of carbons has beenconsumed to an extent. which makes their replacement desirable ornecessary, a fresh pair of carbons'has been fed forward until theiroperative ends are .closer to one another than are the ends of theburning carbons, the are between the burning carbons is thenextinguished, the magazines are caused to move relatively toward oneanother to bring the ends of the fresh carbons into engagement to closethe circuit between them, and the magazines are then relativelyseparated to draw the arc between the fresh carbons. This cycle ofoperations is repeated automatically when it becomes necessary toreplace-the consumed carbons. Fig. 3 shows diagrammatically the circuitsconnecting The movement of the The contacts 22 imity to one another.

the different parts of the lamp as heretofore described whereby thiscycle of operations will occur automatically. In this figure, G, 0represent the pair of burning carbons and G, C represent'a fresh pair ofcarbons, the same being fed forward sufliciently to bring theiroperative ends closerto one another than the operative ends of theburning carbons C, C. In the diagram, 30 represents one side of the linecircuit, it being connected to one of the carbons G, and 31 representsthe circuit of the solenoid 6 which is connected in series between thecarbons and the other side 32 of the line. The contacts 22 of thecut-out 5 are connected, respectively, to the two sides 30 and 32 of theline circuit by the circuits 33 and 34. The contacts 23 which controlthe carbon feeding motor 19 are connected in series in the motor circuit35. The solenoid 4 is connected in shunt with the carbons by the circuit36 one side of which is connected to one carbon and the other side ofwhich is connected to the other carbon and contains a resistance R. Thecontacts 2 are insulated from the magazine supporting them and areconnected in the circuit of the solenoid 4 by a conductor 37 whichshunts out the resistance R of'that circuit. In the diagram, the partsare shown in the positions they occupy immediately prior to the replacing of the consume carbons C, C by the fresh carbons C, C. The areat this time is passing between the consumed carbons C, C, although thepoints or operative ends of the fresh carbons are in closer prox- Thecontacts 2 are so located that one of these contacts will be engaged bone of the projections 3 on the adJacent c ain when the carbons havebeen consumed to the extent which renders their replacement desirable ornecessary. When one of the projections 3 engages one of the contacts 2,a current of maximum strength passes from the side 30 of the linecircuit through the conductor 37 which shunts out the resistance R andthereby ener 'zes the shunt solenoid 4 to its full strengt This causesthe lever 9 to rock to its maximum extent, engaging the contacts 22 ofthe cutout 5, and the cut-out thereb operates to short-circuit thecarbons and t e series solenoid 6. This short-circuiting of the carbonsand the series solenoid extinguishes the are between the burning carbonsand simultaneously deenergizes the series solenoid. This deenergizationof the series solenoid causes the lower ends of the magazines to cometogether, thereby engaging the operative ends of. the fresh pair ofcarbons (which are further advanced than the old or burned carbons),thus reestablishin the circuit through the fresh carbons an the seriessolenoid, and consequent energization of the .series solenoid causesseparation of the freshl carbons which draws the arc between them. Themovement of the lever 9 to close the cut-out which short-circuits thecarbons and series solenoid also engages the contacts 23 in the,circuit'of the carbon feeding motor. This causes-the carbon feeding motor tooperate to feed the fresh carbons C, C to the point where theiroperative ends are in closer relation than the operative ends of theburning carbons, and it also carries the operative projection 3 off thecontact 2, thereby enabling the lamp to resume its normal operation. Inthe normal operation of the lamp, the resistance R is included in thecircuit of the shunt sole-' 'noid 4 so that this solenoid has a strengthonly suflicient to control the contacts 23 which govern the operation ofthe carbon feeding motor 19, and the current passing in series throughthe solenoid 6 causes this solenoid to govern the arc' gap between thecarbons.

I claim as my invention:

1. A magazine are lamp comprising, in combination, means for feedingcarbons in pairs toward one another, said means being operative to feeda new pair of carbons to supplant-the burning carbonsand to a distanceless than that between the points of the burning carbons, meanscontrolled by the carbon-feeding means and embodying a cut-out forshort-circuiting the carbons to extinguish the arc between the burningcarbons,. and an electro-magnetic device connected in series with thecarbons and operative to cause the points of the new carbons to moveinto and out of engagement when such device is deenergized .andenergized, respectively. ,7

2.'An arc lamp comprising, in combination, means for feeding carbons inpairs toward one another, electro-magnetic means connected in serieswith the carbons for causing the points of the carbons to. move into andout of engagement, and means including a short-circuiting cut-out forthe carbons, controlled by the carbon-(feeding means, for extinguishingthe are between one pair of carbons and for deenergizing and energizingsaid electro-magntic means to strike an arc. between another pair ofcarbons.

3. An arc lamp comprising, in combination, means for feeding carbonstoward one another in pairs, said means being operative to feed a freshpair of carbons to supplant a pair of burning carbons and to a distanceless than that between the points of the burning carbons, anelectro-magnetic device connected in series with the carbons andoperative to move the points of the new carbons into and out ofengagement, and means energizing and energizing said serieselectro-"magnetic device to strike an are between the fresh pair ofcarbons.

4. In a magazine are lamp, the combination of means for feeding carbonstoward one another in pairs, said means being operized res ectivelasecond electro-ma netic g 7 p y b device embodying a short-circuitingswitch connected in shunt with the carbons to extin'guish the arebetween the burning carbons and to control the operation of said serieselectro-magnetic device, and means operative by the carbon-feeding meansfor controlling the circuit of said second electro-magfnetic device tocause operation of the latter,when a new pair of carbons has been fed toa predetermined position, to extinguish the are between the burningcarbons and to deenergize the first-mentioned series electro-magneticdevice to cause contact of the points of the new carbons.

5. An arc lamp comprising, in combination, means for feeding carbons inpairs to ward one another, a cut-out for short-circuiting and therebycontrolling the supply of current to said carbons, the carbon-feedingmeans being operative to feed a new pair of carbons to supplant theburning carbons at a predetermined point in the feed of the old carbons,an electro-magnetic device connected in series with the carbons andoperative when deenergized to cause the points of the new carbons tocome into contact and operative whenenergized to separatethe newcarbons, a second electro-magnetic device controlling the operation ofthe carbon-feeding means and the cut-out and operative. when energizedto interrupt ,the feed of the carbons to operate the cut-out toshort-circuit the carbons, and to deenergize the first-mentioned serieselectro-magnetic device, means operative by the carbonfeeding means toestablish, through said second-mentioned electro-magnetic device, acircuit in shunt with the carbons, whereby the cut-out is operatedto'extinguishthe are between the burning carbons when the new carbonshave been fed to a predetermined position, and to deenergize thefirst-mentioned series electro-magnetic device to cause engagement ofthe new carbons to complete a circuit between them.

. 6. A magazine are lamp compr sing means forfeeding carbons toward oneanother in controlled by the carbon-feeding means for pairs and adaptedto feed a new pair of short-'circuiting the burning carbons to excarbonsto supplant burning carbons at a tinguish the are between them and fordepredetermined point in the feed of said burning carbons,electro-magnetic means in series with the carbons and operative to causethe carbons to move into and out of engagement, an electro-magneticdevice in shunt with the carbons and controlling the operation of thecarbon-feeding means, said shunt electro-magnetic device embodying acut-out for short-circuiting the carbons, whereby the are between theburning carbons is momentarily extinguished and said serieselectro-magnetic means is deenergized to cause contact between thepoints of the new carbons, and means operative by the carbon-feedingmeans for controlling the operation of said shunt electro-magnetic de- 1vlce.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JAMES BROOKIE.

Witnesses:

JOSEPH MILLARD, WALTER J. SKERTEN.

